Star in the constellation Cancer
42 Cancri is a single star in the northern zodiac constellation of Cancer . With an apparent visual magnitude of 6.83, it is dimmer than what is considered the normal lower limit for visibility with the naked eye. The star is located at a distance of approximately 616 light years from the Sun based on parallax , and is drifting further away with a radial velocity of +35 km/s. 42 Cancri is a member of the Beehive Cluster (NGC 2632 ).
The stellar classification of this star is A7III, matching an A-type star that is in the giant stage . However, this may be a misclassification of a main sequence star. It has also been classified as a spectroscopic binary , although no orbital elements are published. 42 Cancri is an estimated 603 million years old and is spinning rapidly with a projected rotational velocity of 195 km/s. The star has 2.39 times the mass of the Sun and 4.2 times the Sun's radius . It is radiating 51.5 times the luminosity of the Sun from its photosphere at an effective temperature of 7,607 K.
References
^ Brown, A. G. A. ; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties" . Astronomy & Astrophysics 616 . A1. arXiv :1804.09365 . Bibcode :2018A&A...616A...1G . doi :10.1051/0004-6361/201833051 .Gaia DR2 record for this source at VizieR .
^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters , 38 (5): 331, arXiv :1108.4971 , Bibcode :2012AstL...38..331A , doi :10.1134/S1063773712050015 , S2CID 119257644 .
^ Gray, R. O.; et al. (2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", The Astronomical Journal , 121 (4): 2148, Bibcode :2001AJ....121.2148G , doi :10.1086/319956 , S2CID 117076031 .
^ Bochanski, John J.; et al. (April 2018), "Fundamental Properties of Co-moving Stars Observed by Gaia", The Astronomical Journal , 155 (4): 17, arXiv :1801.00537 , Bibcode :2018AJ....155..149B , doi :10.3847/1538-3881/aaaebe , S2CID 119256051 , 149.
^ Treanor, P. J. (1960), "Stellar rotation in galactic open clusters", Monthly Notices of the Royal Astronomical Society , 121 (6): 503, Bibcode :1960MNRAS.121..503T , doi :10.1093/mnras/121.6.503 .
"42 Cnc" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2018-07-08.^ Mason, Brian D.; et al. (August 1993), "ICCD Speckle Observations of Binary Stars. IX. A Duplicity Survey of the Pleiades, Praesepe, and IC 4665 Clusters", Astronomical Journal , 106 : 637, Bibcode :1993AJ....106..637M , doi :10.1086/116669 .
Clampitt, Lori; Burstein, David (August 1997), "Spectrophotometry of 237 Stars in 7 Open Clusters", Astronomical Journal , 114 : 699–712, arXiv :astro-ph/9705160 , Bibcode :1997AJ....114..699C , doi :10.1086/118504 , S2CID 15968133 .
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